Battery Choice

Hello everyone i'm new to this forum and owning my DJI Phantom. I currently only run the stock battery and have been looking in the market for some more batteries.

I have heard of people getting good results having the parallel battery under mount but Id need the batteries to do that.

Have come down to a few batteries i have been looking at for single and or parallel use. What do you guys think?
Oh I plan on running with a go pro camera too so looking for a decent flight time of 10+mins